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Substrate modulation, group effects and the behavioral responses of entomopathogenic nematodes to nematophagous fungi.
MedLine Citation:
PMID:  21145324     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Laboratory experiments were conducted on the behavioral responses of five species of entomopathogenic nematodes (EPNs; Steinernema diaprepesi, Steinernema sp. glaseri-group, Steinernema riobrave, Heterorhabditis zealandica, Heterorhabditis indica) to three species of nematophagous fungi (NF; trapping fungus Arthrobotrys gephyropaga; endoparasites Myzocytium sp., Catenaria sp.). We hypothesized that EPN responses to NF and their putative semiochemicals might reflect the relative susceptibility of EPNs to particular NF species. EPN responses to "activated" NF (i.e., induced to form traps or sporangia by previous interactions with nematodes) versus controls of non-activated NF or heat-killed EPNs were compared in choice experiments on water agar in Petri dishes (dia=9cm) and in horizontal sand columns (8cm L×2.7cm dia). On agar, all EPN species were attracted to all activated NF species except for S. riobrave, which was neutral. In sand, all EPN species were repelled by activated Arthrobotrys but attracted to activated Myzocytium and Catenaria, except H. indica (neutral to Myzocytium) and Steinernema sp. (neutral to Catenaria). EPN behavioral responses appeared unrelated to relative susceptibility to NF except that H. indica exhibited low susceptibility and a neutral response to Myzocytium in sand whereas the remaining EPNs were highly susceptible and attracted. These results indicate potential complexity (i.e., mixed responses, aggregation or group movement) and species specificity in the responses of EPNs to NF, demonstrate that results on agar can differ markedly from those in sand, and underline the potential importance of utilizing natural substrates to properly assess the role of semiochemicals in nematode-fungus interactions.
Authors:
Fahiem E El-Borai; Raquel Campos-Herrera; Robin J Stuart; Larry W Duncan
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2010-12-8
Journal Detail:
Title:  Journal of invertebrate pathology     Volume:  -     ISSN:  1096-0805     ISO Abbreviation:  -     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2011-1-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0014067     Medline TA:  J Invertebr Pathol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2010 Elsevier Inc. All rights reserved.
Affiliation:
Entomology and Nematology Department, University of Florida, IFAS, Citrus Research and Education Center,700 Experiment Station Road, Lake Alfred, FL 33850-2299, USA; Plant Protection Department, Faculty of Agriculture, El Zagazig University, Zagazig, Egypt.
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